Time & Space

Jessica takes charge this episode by asking two questions: 1) What is the definition of a "Doctor Who" companion? and 2) Which companion would make the best Doctor?

The Whovian debate about favorite Doctors and companions will last forever, but not many companions would be able to take the wheel ... er, switch? ... of the TARDIS. Jessica and Phillip take turns listing their nominations for which companion could fill the Time Lord's shoes.
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Do you agree with their definiton of a companion or do you have one of your own? And which companion would you nominate as the best able to be a "Doctor"?